Category: Critical Care
Keywords: ultrasound, ocular, sonography, intracranial pressure, optic nerve sheath, ICP (PubMed Search)
Posted: 11/9/2010 by Haney Mallemat, MD
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Ocular sonography is a fast, simple, and non-invasive tool to detect elevated intracranial pressure (ICP) by measuring the optic nerve sheath diameter (ONSD). Several studies have shown a positive correlation between increased ONSD (>5.7mm) and elevated ICP (>20mmHg). Although ultrasound may not replace CT or MRI to diagnose the cause of the increased ICP, its use as a triage tool can expedite these tests.
Please see the references below for more information and, as with any new technique please consult local experts prior to making clinical decisions.
Soldatos, T. et al. Optic nerve sonography in the diagnostic evaluation of adult brain injury. Crit Care. 2008; 12(3): R67. Epub 2008 May 13.
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